Finding the Fourth Proportional to 13,105.64, 18,080.82 and 8,389.16

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.64 : 18,080.82 = 8,389.16 : x
2. Step 2: Convert to fraction form
   13,105.64/18,080.82 = 8,389.16/x
3. Step 3: Cross multiply
   13,105.64x = 18,080.82 × 8,389.16
4. Step 4: Simplify right side
   13,105.64x = 151,682,891.91
5. Step 5: Solve for x
   x = 151,682,891.91/13,105.64
6. Step 6: Final answer
   x = 11,573.86